Fire detector



FIG. 1 is a front view of a a fire detector, showing our new design; FIG. 2 is a rear view thereof; FIG. 3 is a top plan view thereof; FIG. 4 is a bottom plan view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a left side view thereof; and, FIG. 7 is an enlarged cross-sectional view thereof, taken along line 7—7 in FIG. 1, with the internal system omitted. 

The ornamental design for a fire detector, as shown and described. 